Mask mandates are under review by OSHA and that may result in some workers must wear masks while others do not. Additionally, private companies can mandate masks for their employees just as they can mandate uniforms, no sleeveless tops or no flip flops.

Mask mandates are not unconstitutional as this information shows.  OSHA is working on a final rule which will affect almost everyone but for rght now mask mandates are inplace for federal workers, etc, and in various states as shown here.

https://www.littler.com/publication-press/publication/facing-your-face-mask-duties-list-statewide-orders

For different reasons, not for a virus like this,  it’s not really a vaccine it’s a shot.

You're nitpicking words.  Measles is a VIRAL disease, vaccine for it is a shot.  Chickenpox, rubella, mumps, shingles.  All virus, all vaccines and all admonistered by a needle injecting  the vaccine into the body...commonly called a shot!  DH just got his shingles s.h.o.t.

https://www.pewresearch.org/fact-tank/2021/10/08/states-have-mandated-vaccinations-since-long-before-covid-19/

But we’ve already ageeed those types of vaccines prevent infection where covid does not.

Flu vaccine doesnt, nor does shingles.  I read sometime ago that there is rising suspicions that if tested, we may find that some previously thought lifetime protection vaccines are not lifetime vaccines.  Measles is one of them I think! But don't quote me on that as Im probably wrong.   

They last longer than 6 months.

Does flu vaccine?  I've never had one.  

Flu shots aren’t vaccines. They target the most likely strains to hit each year.  People who get them every year tend to have less flu and they aren’t quite sure why, because immunities are supposed to last only through that season.  However, they seem to give some more lasting protection.